Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Antlia |
Right ascension | 09h 44m 12.09512s [1] |
Declination | –27° 46′ 10.1011″ [1] |
Apparent magnitude (V) | 4.79 [2] |
Characteristics | |
Spectral type | A8 Vm + G7 III [3] |
U−B color index | +0.35 [2] |
B−V color index | +0.50 [2] |
Astrometry | |
Radial velocity (Rv) | +24.0 [4] km/s |
Proper motion (μ) |
RA: –53.23
[1]
mas/
yr Dec.: +37.24 [1] mas/ yr |
Parallax (π) | 7.5602 ± 0.8169 mas [5] |
Distance | approx. 430
ly (approx. 130 pc) |
Orbit [6] | |
Companion | θ Ant B |
Period (P) | 18.32 yr |
Semi-major axis (a) | 0.134″ |
Eccentricity (e) | 0.445 |
Inclination (i) | 124° |
Longitude of the node (Ω) | 176.8° |
Periastron epoch (T) | 1965.75 |
Details [7] | |
θ Ant A | |
Mass | 1.8 ± 0.1 M☉ |
θ Ant B | |
Mass | 2.1 ± 0.5 M☉ |
Other designations | |
Database references | |
SIMBAD | data |
Theta Antliae (θ Ant, θ Antliae) is the Bayer designation for a binary star in the southern constellation of Antlia. The pair have a combined apparent visual magnitude of +4.78; [2] the brighter component is magnitude +5.30 while the secondary is +6.18. [9] Based upon parallax measurements, it is located at a distance of around 430 light-years (130 parsecs) from Earth.
The primary component of this system, θ Antliae A, has a stellar classification of A8 Vm, [3] indicating that it is an A-type main sequence star with enhanced metallic lines in its spectrum. The companion, θ Antliae B, is a giant star with a classification of G7 III. [3] The pair have an orbital period of 18.3 years, a significant eccentricity of 0.445, and they have an angular separation of 0.1 arcseconds. [6]
{{
cite web}}
: CS1 maint: postscript (
link)
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Antlia |
Right ascension | 09h 44m 12.09512s [1] |
Declination | –27° 46′ 10.1011″ [1] |
Apparent magnitude (V) | 4.79 [2] |
Characteristics | |
Spectral type | A8 Vm + G7 III [3] |
U−B color index | +0.35 [2] |
B−V color index | +0.50 [2] |
Astrometry | |
Radial velocity (Rv) | +24.0 [4] km/s |
Proper motion (μ) |
RA: –53.23
[1]
mas/
yr Dec.: +37.24 [1] mas/ yr |
Parallax (π) | 7.5602 ± 0.8169 mas [5] |
Distance | approx. 430
ly (approx. 130 pc) |
Orbit [6] | |
Companion | θ Ant B |
Period (P) | 18.32 yr |
Semi-major axis (a) | 0.134″ |
Eccentricity (e) | 0.445 |
Inclination (i) | 124° |
Longitude of the node (Ω) | 176.8° |
Periastron epoch (T) | 1965.75 |
Details [7] | |
θ Ant A | |
Mass | 1.8 ± 0.1 M☉ |
θ Ant B | |
Mass | 2.1 ± 0.5 M☉ |
Other designations | |
Database references | |
SIMBAD | data |
Theta Antliae (θ Ant, θ Antliae) is the Bayer designation for a binary star in the southern constellation of Antlia. The pair have a combined apparent visual magnitude of +4.78; [2] the brighter component is magnitude +5.30 while the secondary is +6.18. [9] Based upon parallax measurements, it is located at a distance of around 430 light-years (130 parsecs) from Earth.
The primary component of this system, θ Antliae A, has a stellar classification of A8 Vm, [3] indicating that it is an A-type main sequence star with enhanced metallic lines in its spectrum. The companion, θ Antliae B, is a giant star with a classification of G7 III. [3] The pair have an orbital period of 18.3 years, a significant eccentricity of 0.445, and they have an angular separation of 0.1 arcseconds. [6]
{{
cite web}}
: CS1 maint: postscript (
link)